/* fft/gsl_fft_real.h

 * 

 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough

 * 

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 3 of the License, or (at

 * your option) any later version.

 * 

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 * 

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 */

#ifndef __GSL_FFT_REAL_H__

#define __GSL_FFT_REAL_H__

#include <stddef.h>

#include <gsl/gsl_math.h>

#include <gsl/gsl_complex.h>

#include <gsl/gsl_fft.h>

#undef __BEGIN_DECLS

#undef __END_DECLS

#ifdef __cplusplus

# define __BEGIN_DECLS extern "C" {

# define __END_DECLS }

#else

# define __BEGIN_DECLS /* empty */

# define __END_DECLS /* empty */

#endif

__BEGIN_DECLS

int gsl_fft_real_radix2_transform (double data[], const size_t stride, const size_t n) ;

typedef struct

  {

    size_t n;

    size_t nf;

    size_t factor[64];

    gsl_complex *twiddle[64];

    gsl_complex *trig;

  }

gsl_fft_real_wavetable;

typedef struct

  {

    size_t n;

    double *scratch;

  }

gsl_fft_real_workspace;

gsl_fft_real_wavetable * gsl_fft_real_wavetable_alloc (size_t n);

void  gsl_fft_real_wavetable_free (gsl_fft_real_wavetable * wavetable);

gsl_fft_real_workspace * gsl_fft_real_workspace_alloc (size_t n);

void  gsl_fft_real_workspace_free (gsl_fft_real_workspace * workspace);

int gsl_fft_real_transform (double data[], const size_t stride, const size_t n,

                            const gsl_fft_real_wavetable * wavetable,

                            gsl_fft_real_workspace * work);

int gsl_fft_real_unpack (const double real_coefficient[],

                         double complex_coefficient[],

                         const size_t stride, const size_t n);

__END_DECLS

#endif /* __GSL_FFT_REAL_H__ */